This document discusses the four primary tissue types - epithelial, connective, muscular, and nervous tissue. It focuses on epithelial tissue, describing the different types of epithelial cells including squamous, columnar, cuboidal, pseudostratified ciliated columnar, stratified squamous, transitional, and glandular epithelia. The key functions and locations of each epithelial cell type are outlined.
Cartilage is a resilient and smooth elastic connective tissue, a rubber-like padding that covers and protects the ends of long bones at the joints, and is a structural component of the rib cage, the ear, the nose, the bronchial tubes, the intervertebral discs, and many other body components.
Histology
Junqueira’s Basic Histology Text and Atlas, 15th Ed
Cartilage is a resilient and smooth elastic connective tissue, a rubber-like padding that covers and protects the ends of long bones at the joints, and is a structural component of the rib cage, the ear, the nose, the bronchial tubes, the intervertebral discs, and many other body components.
Histology
Junqueira’s Basic Histology Text and Atlas, 15th Ed
The femoral triangle is a wedge-shaped area located within the superomedial aspect of the anterior thigh. The femoral triangle is a hollow region located in the supero-medial part of the anterior thigh.
Biological tissue is a collection of interconnected
cells that perform a similar function within an
organism.
In other words, it is a group of cells working together mainly inside an organ.Epithelial cells cover or line all body surfaces, cavities and tubes. So, These are called covering epithelia.Epithelial cells form the functional units of secretory glands. So, These are called glandular epithelia.
The femoral triangle is a wedge-shaped area located within the superomedial aspect of the anterior thigh. The femoral triangle is a hollow region located in the supero-medial part of the anterior thigh.
Biological tissue is a collection of interconnected
cells that perform a similar function within an
organism.
In other words, it is a group of cells working together mainly inside an organ.Epithelial cells cover or line all body surfaces, cavities and tubes. So, These are called covering epithelia.Epithelial cells form the functional units of secretory glands. So, These are called glandular epithelia.
A tissue may be defined as an aggregate or collection of same type of cells performing the same general functions of the body. For example: Blood, bone, muscle etc.
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Session Overview
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1. Chapter 4: Tissues, Part 1
Tissue = A collection of cells that perform related functions,
and are similar in structure, or a mass of like cells
Histology = The study of tissues
The Four Primary Tissue Types
Epithelial
Connective
Muscular
Nervous
Developed by
John Gallagher, MS, DVM
2. Epithelial Tissue
1. Epithelium / -a = cell layer (barrier)
Epi = on or upon
Protection: covering or lining—inside and out
Permeability control: selective secretion and
absorption
Sensation: touch receptors etc. and neuroepithelium
of special senses
2. Glands = secretory structure
Specialized secretions
Saliva, hormones, many others
•The Four Primary Tissue Types
Epithelial
Connective
Muscular
Nervous
4. Structural Characteristics of
Epithelia p 69
apical
Cellularity (little to no IC
Space)
Cell to cell contacts
Polarity (sometimes)
basal
Basement Membrane
Support by connective tissue
BM Avascular (esp. epidermis)
Regeneration/repair
6. Classification of Epithelia
The function of the epithelium determines
which type.
Typically classified according to
1. Number of cell layers
Simple vs. Stratified
2. Shape of cell
Squamous, cuboidal, columnar
7. Simple Squamous Epithelium
Location:
Lining of ventral body
cavities, e.g.
peritoneum
Lining of blood
vessels (endothelium)
Alveoli of lung
Bowman’s Capsule
8. Function of Simple Squamous E.
Friction reduction (cavity lining)
Blood vessel permeability control
(capillaries and Bowman’s capsule)
Gas absorption and secretion (lung)
Not protective—only one cell thick
13. Pseudostratified Ciliated Columnar
Epithelium
Function:
Mucociliary Blanket
Mixture of cell types nuclei
located at various distances from
surface. Yet: all cells contact BM
Location:
Ducts of Respiratory tract
i.e., trachea and bronchi
14.
15. Stratified Squamous Epithelium
Function
Protection against abrasion, pathogens,
chemicals, heat/cold…
Keratinized vs. non-keratinized
Location ? Where we need protection!
Skin surface
Entrances/exits of body, e.g. mouth, vagina
22. Glandular Epithelia
Types of Glandular Secretions:
Exocrine Endocrine
Glands have ducts Glands have no
Secretion to the ducts
“outside” of the body Hormones (into
Simple or compound the bloodstream)